@conference {4230,
	title = {Integrated physical-chemical procedure for soil organic carbon fractionation and characterization during transition to organic farming},
	booktitle = {Functions of natural organic matter in changing environment},
	year = {2013},
	publisher = {Springer},
	organization = {Springer},
	address = {China},
	abstract = {<p>Two field experiments, in the south of Italy, were established in 2009 to study and characterize SOM during transition to organic farming. Experiments included a cereal/leguminous rotation fertilized with permitted amendments with three field replicates. A sequential fractionation procedure was used to separate different SOM fractions: light fraction (LF), two size classes of particulate organic matter (POM), mobile humic acid (MHA) and Ca-bound humic acid (CaHA). Isolated fractions were quantified and analyzed for their C and N content and carbohydrates and amino compounds composition. The masses of the isolated fractions increased during 2-year course, with noticeable increases in LF and POM. Moreover LF and POM were found more responsive than MHA to treatment and crop. The xylose/mannose ratio explained that MHA-carbohydrates were mainly of microbial origin while LF- and POM-carbohydrates were of plant origin. Amino compounds constituted up to 30\% of total soil N and were found to be more responsive to seasonal variation than to agronomic practices.</p>
},
	url = {http://link.springer.com/chapter/10.1007/978-94-007-5634-2_13},
	author = {H.M. Abdelrahman and D. Olk and C. Cocozza and D. Venterella and F. Montemurro and T. Miano}
}
